1816020816 has 40 divisors (see below), whose sum is σ = 4720188960. Its totient is φ = 601623936.

The previous prime is 1816020809. The next prime is 1816020823. The reversal of 1816020816 is 6180206181.

It is an interprime number because it is at equal distance from previous prime (1816020809) and next prime (1816020823).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108231 + ... + 123878.

It is an arithmetic number, because the mean of its divisors is an integer number (118004724).

Almost surely, 2^1816020816 is an apocalyptic number.

1816020816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1816020816 is an abundant number, since it is smaller than the sum of its proper divisors (2904168144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1816020816 is a wasteful number, since it uses less digits than its factorization.

1816020816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232283 (or 232277 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 1816020816 is about 42614.7957404468. The cubic root of 1816020816 is about 1220.0387016299.

Adding to 1816020816 its reverse (6180206181), we get a palindrome (7996226997).

The spelling of 1816020816 in words is "one billion, eight hundred sixteen million, twenty thousand, eight hundred sixteen".